19 is only 1 away from 20, so you prefer to start by multiplying 20 times 5, which equals 100. Then we need to take away a squadron of 5, because there are actually only 19 squadrons, not 20. 100 take ...
I used to see the double dash (--) in Excel spreadsheets and wonder what it did. It's an essential shortcut to force Excel to treat TRUE and FALSE as the numbers 1 and 0, meaning you can easily sum or ...
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